In Lecture VI of his Agriculture Course, Rudolf Steiner uses the field mouse while discussing animal pest peppers. The animal also offers a way to observe seed-eating life in the farm landscape. Its role in open fields can be appreciated alongside careful protection of stored grain and food-handling areas.
Old-field experiments in Michigan found that deer mice selected among the plant seeds tested and preferred larger-seeded species. Seed removal was higher in vegetated habitats than on disturbed soil. This offers growers a concrete observation: watch seed fall, seed-eating activity, and seedling emergence in a few marked field areas over time.
Biodynamic pest peppers are specific to their target. In Steiner's field-mouse example, the animal-pepper material was ashed mouse skin. JPI's weed-pepper guidance instead begins with seed from the target weed, or rhizome for a spreading perennial, and describes ash, char, gentle toast, and putrefaction methods. Applied Biodynamics Issue 108 gives further method-specific discussion. Growers can observe field-mouse seed predation as part of the living farm while following JPI's separate preparation directions.
